Assign the corresponding VpnProfileState for the null argument. The varargs parameter has type "VpnProfileState...". It needs to decide whether the implementation want the argument to be treated as a single-element of type VpnProfileState or no arguement. Otherwise, it will confuse the compiler and cause warning. Test: atest VpnTest Change-Id: Ic1dee696bb50cd78849de4812fb46fd764b23c6e